FISHIOLOGY

This video demonstrate how the Giant Borneo gouramy changes its pattern according to its mood. It can formed the common Giant Gouramy concave pattern and switched to the Giant borneo gouramy tappered pattern at a snapped of a finger. I've never encountered a fish that can change its pattern to disguise as another species. Why do they display this behavior? Concave Bar Tappered Bar Changing bar pattern

Osphronemus Septemfasciatus can also show the bar pattern of Osphronemus Goramy, I only notice this phenomena when the fish is around 14". Are these pattern emerged only when they are sub adult? When I was searching for the O.Sep I came across a variant of Osphronemus Goramy Kapuas hulu, they show correlative pattern of the O.Sep. The hulu kapuas var O.Goramy is rather confusing as they are so similar to the O.Sep except for the concave bar. After encountering my O.Sep forming the same bar pattern, I can't help but wonder if the O.Goramy var hulu kapuas that I came across earlier are they the same fish? I do not have a clear photo but the only way to identify them apart now is the cheek line pattern. It will be tricky to ID the O.Sep from the O.Goramy hulu kapuas. O.Sep forming the concave bar, they show this bar pattern according to their mood and will revert back to their original tappered bar. A variant of O.Goramy from hulu kapuas